Coating water resistance test using

Organic coatings are commonly evaluated using salt water immersion, salt fog or spray, modified salt exposure tests (e.g., salt fog with added SO2), and various cyclic exposure tests. Humidity exposure and water immersion, and, for many applications, physical resistance tests (adhesion, impact resistance, etc.) are widely used preliminary tests. Standard methods for most of these tests are given in compilations of standard tests such as the Annual Book of ASTM Standards (16). Test methods have been extensively reviewed (e.g., 17-23). 

F.M. Gel fand V.S. Alipchenko, Ibid 1967, (63/20), 209-12 CA 69, 11865m (1968) [Reasons for a fail are and break in detonations in flooded coal mines were investigated, Expis Ammonit PZhV-20 and Uglenit E-6, coated with water-resistant material, were used in testing. (Compns are not given in CA). It was decided that the excess pressure of CH4 in flooded coal faces was the cause of failure and break of detonation]... 

ASTM D1735 Testing the water resistance of coatings using water-fog apparatus (practice). 

The second chemical resistance test, the water attack test, is exclusively used for Type II glass because its properties come from a coating that would not be represented if powdered. In this test, containers... 

Research on the dielectric characteristics of coating films was performed using a teraohmmeter. Five samples of different coating compositions were examined on a metal substrate. Samples were prepared on the basis of two types of water dispersion rubbers, CSM-200 and CSM-400. The test samples were placed in a drying oven. The electrical resistance of the samples was measured via thermocouple wires that were connected to the teraohmmeter. The results of tests are shown on Figures 5.3 and 5.4. 

D870—09 Standard Practice for Testing Water Resistance of Coatings Using Water Immersion... 

The dissolution of material into an aqueous solution and so on, has a merit as well as a demerit to the enviroimient. Consider coated materials for an example. One of the objectives of a surface treatment such as plating is to improve corrosion resistance. In this case, it is preferable that the materials do not dissolve in water. This improvement of corrosion resistance enables the long-term use of materials, and will contribute to the reduction of resources and energy required for materials production. In Japan, JIS (Japanese Industrial Standards) H8502 (1999) regulates the methods of corrosion resistance tests for metallic coatings so as to evaluate the corrosion of a material. This standard includes the ISO 4540 (1980), ISO 4541 (1978) and others. 

Jute sandwich composite wall panels have been developed using jute laminate as a face and plastic wood/honeycomb as a core material for prefabricated stmcture. The thickness of panels is ranged between 25 and 65 mm. The panels are lightweight, rigid, and easy to install with simple tools to an open frame work. During impact test, the panels withstand against 5 and 25 kg sand-filled leather balls after several blows. The face material coated with gelcoat on the outer surface is water resistant. 

ASTM D 2247, Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity, was originally pubhshed in 1966. As the title implies, it is primarily used to test the water resistance of coated specimens. The apparatus as depicted in D 2247 is shown in Fig. 2. 

Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation Standard Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials Standard Practice for Recording Data from Atmospheric Corrosion Tests of Metallic-Coated Steel Specimens... 

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